#!/usr/bin/env python

x=50

def f(x):
    print ('x is ', x)
    x=200
    print ('x is ', x)

def g():
    print ('x is ', x)
    
f(100) # 100, 200
f(x)   # 50,  200

g()    # 50


def maximum (x,y) :
    '''Select the bigger one of x and y.

x and y must be integers.'''
    
    if x > y:
        return x
    else:
        return y

print (maximum(2,1))
print ('-----------------------------')
print (maximum.__doc__)
print ('-----------------------------')
help (maximum)

